T_Shee Posted October 13, 2011 Report Posted October 13, 2011 so i have been fighting this problem for a year or so now. bike is a 4 mil stock cyl. dune port by k and t with 35 pwk and r2 pipes. bike starts and revs great sitting still. but when i take it for a rip it will cut out at higher rpm for the first couple passes. then once it is warmed up and cleaned out it is fine until i shut it off and take a break then i have to go thru the same thing again. also when trail riding it runs great as long as we are just going thru the trails. but as soon as we hit an open patch and i open it up it will cut out until i run it hard thru the gears a time or two. it feels kinda like a plug cap but it is more random and you can tell it is missing on both sides. i have tried so many different combinations of parts over the past year and nothing has really cured it. i have tried countless plug caps (new and used) cdi, 2 stators. coils, flywheels etc. my next step is to get another wire harness and try that. i have always used the br8es plug and my timing is currently at +6 (tried stock timing and no difference). maybe i am missing something so i was hoping someone would be able to catch it. thanks in advance. i should also mention that i have had different top ends over the last year as well as different jetting combinations and none have made this problem go away. Quote
T_Shee Posted October 13, 2011 Author Report Posted October 13, 2011 have you cleaned out your carbs? sounds like it lacks fuel or has a hard time drawing fuel to the engine for the first bit or something Ya I clean them pretty regularly. It shows no signs of being lean Quote
coryv4 Posted October 13, 2011 Report Posted October 13, 2011 if you say when its cool does it get better as you go its prolly due to the cylinders being could when they warm up the rings expand Quote
T_Shee Posted October 14, 2011 Author Report Posted October 14, 2011 it only gets better when i run it hard for a couple passes or thru the gears hard a time or two. i can be riding for an hour in tighter trails and as soon as get into an opening and get higher into the powerband it starts cutting out. then after a i run it hard for a bit it goes away. one thing ive been thinking about is excess fuel laying in crankcase from slower riding maybe gets sucked up when i get on the pipe hard. but doesnt explain why it does it when the bike sits and cools down for 10 minutes. Quote
Jereme6655 Posted October 14, 2011 Report Posted October 14, 2011 you sure your not running super fat on the pilot or on the main? wonder if its just loading up until you beat it down hard to burn up the excess that is trying to make its way into your cases... Quote
T_Shee Posted October 14, 2011 Author Report Posted October 14, 2011 i dont think so but i am gonna play with jetting a bit more. i currently have 45 pilot and 152 mains. plugs have always looked nice and tan. when it cooled down at night a couple weekends ago they started looking a little lean so i adjusted the needle. also i am running 180 psi per cylinder and straight 110 and amsoil domiinator 50:1. im getting ready to order another harness just to try. i cut my harness down and moved my cdi and regulator to the front so maybe there is a bad connector in the harness or something. Quote
4MiLLDraGSheE Posted October 15, 2011 Report Posted October 15, 2011 180 psi at 6 degrees of timing. You always run the same fuel. Maybe you could find you pressure ratio Nd see if ur running the right fuel. I could be wrong. Quote
Jereme6655 Posted October 15, 2011 Report Posted October 15, 2011 how cool of a motor are we talking here...... are you talking like kick it over from dead cold and give it 20 seconds to warm up or are we talking giving it a healthy warm up and when its up at operating temp it will also do it? Quote
shakar Posted October 15, 2011 Report Posted October 15, 2011 float hieght? u got a pingle n drilled cap ? hows the pick up gap? maybe untape ur harness and take a peek??? goodluck Quote
T_Shee Posted October 17, 2011 Author Report Posted October 17, 2011 180 psi at 6 degrees of timing. You always run the same fuel. Maybe you could find you pressure ratio Nd see if ur running the right fuel. I could be wrong. I've tried backing the timing off before and it didn't help. I'm gonna try again tho Quote
T_Shee Posted October 17, 2011 Author Report Posted October 17, 2011 how cool of a motor are we talking here...... are you talking like kick it over from dead cold and give it 20 seconds to warm up or are we talking giving it a healthy warm up and when its up at operating temp it will also do it? I let it warm up pretty good. Doesn't really matter tho. It always does it for the first couple hard rips no matter how long I been riding. Quote
T_Shee Posted October 17, 2011 Author Report Posted October 17, 2011 float hieght? u got a pingle n drilled cap ? hows the pick up gap? maybe untape ur harness and take a peek??? goodluck Has a billet cap. Did same thing with stock drilled cap. Pickup gap is good and pickup coil has les than 20 hours on it. I made a dual feed petcock out of stocker but I know it doesn't flow any better. Doesn't feel like bowls are running empty cuz it pulls hard when it stops missing out. Floats are set to spec Quote
Hubcap Posted October 19, 2011 Report Posted October 19, 2011 Mine use to do that as well. My issue was my jetting was to low on the main I had 152's to start now im at 160's and problem solved. May just need a fatter jet. Quote
EvilBanshee Posted October 19, 2011 Report Posted October 19, 2011 PLug Boots!! I had a similar issue. IT would run fine standing still and in the trails. Once i wound wind her out. It would drop a cylinder. Quote
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